If the diesel fuel vapors present are within the flammable range （）.<br>A:the vapor air mixture is too rich to burn<br>B:an explosion may occur if a source of ignition is present<br>C:the vapor air mixture is too lean to bum the upper explosive<br>D:limit has been exceeded

If the diesel fuel vapors present are within the flammable range （）.
A:the vapor air mixture is too rich to burn
B:an explosion may occur if a source of ignition is present
C:the vapor air mixture is too lean to bum the upper explosive
D:limit has been exceeded

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